Features High Efficiency Built with 12W Sun Power polysilicon solar panels, its maximum solar conversion efficiency is up to 22%. Great for providing power to charge two devices simultaneously while converting extra sunlight into energy & storing in the built-in battery. High Capacity Internal 10000 m Ah lithium polymer battery, rechargeable via solar panels, is ideal for charging your smartphones, tablets, GPS or other USB (Universal Serial Bus)-enabled devices. With 4 LED lights to indicate battery levels. Dual USB (Universal Serial Bus) Ports Automatically detect your device & deliver the fastest possible charging speed up to 2.1 amps per port or 2.1 amps overall. During solar charging, it charges connected devices first. Foldable Portable Compact size & foldable design enable easy storage & carrying. Well-placed eyelets allow easy attachment to backpacks, trees, or tents. Convenient Storage Pouch The sewn-on zipper storage pouch provides a convenient place to hold your device & USB (Universal Serial Bus) charging cables, & keeps your device out of the wind or direct sun while charging. Safe Reliable Built-in over charging, over discharging, over current, & short circuit protection keep you & your devices safe. Flexible Adjustable The drawstring & the collapsible holder let you adjust it to different angles flexibly in order to absorb sunlight efficiently.